wolfi3 usmanakram232

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

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Python 2.x

$ python -m SimpleHTTPServer 8000

This is not intended to be comprehensive or authoritative, just free online resources I've found valuable while learning more about Erlang.

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Instruction

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs 4X memory

	"""
	Outputs history with bash and git aliases expanded.
	"""
	from __future__ import print_function

	import re
	from subprocess import check_output

	BASH_ALIASES = {}
	for line in check_output('bash -i -c "alias -p"', shell=True).split('\n'):

	package java8tests ;

	import java.util.function.BiFunction ;
	import java.util.function.Function ;

	public class Currying {

	public void currying() {
	// Create a function that adds 2 integers
	BiFunction<Integer,Integer,Integer> adder = ( a, b ) -> a + b ;

-# delete local tag '12345'
-git tag -d 12345
-# delete remote tag '12345' (eg, GitHub version too)
-git push origin :refs/tags/12345
-# alternative approach
-git push --delete origin tagName
-git tag -d tagName

	import java.time.*;
	import java.time.format.DateTimeFormatter;
	import java.time.format.FormatStyle;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.TemporalAdjusters;
	import java.util.*;

	import static java.time.temporal.TemporalAdjusters.*;

	public class Java8DateTimeExamples {

	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>group</groupId>
	<artifactId>dummy</artifactId>
	<name>Dummy Project</name>
	<version>1.0.12</version>
	<packaging>pom</packaging>
	<scm>
	<connection>scm:git:https://......</connection>
	<tag>HEAD</tag>